Broken ReorderableListView#onReorder demo

main.dart

import 'package:flutter/material.dart';

void main() => runApp(OnReorderDemo());

class OnReorderDemo extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'onReorder Demo',
      home: MyReorderableList(),
    );
  }
}

class MyReorderableList extends StatefulWidget {
  MyReorderableList({Key key}) : super(key: key);

  @override
  _MyReorderableListState createState() => _MyReorderableListState();
}

class _MyReorderableListState extends State<MyReorderableList> {
  final _items = ['foo', 'bar', 'fizz', 'buzz']
      .map((title) => ListTile(
        title: Text(title),
        key: Key(title),
      ))
      .toList();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('ReorderableListView#onReorder Demo'),
      ),
      body: ReorderableListView(
        children: _items,
        onReorder: (oldIndex, newIndex) {
          print('oldIndex: $oldIndex, newIndex: $newIndex, length: ${_items.length}');
        },
      ),
    );
  }
}